Journal of Medical Physics
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Year : 2017  |  Volume : 42  |  Issue : 1  |  Page : 48-54

Assessment of regional pediatric computed tomography dose indices in Tamil Nadu

1 Department of Radiology, PSG Hospitals, Coimbatore, Tamil Nadu, India
2 Department of Applied Science, PSG College of Technology, Coimbatore, Tamil Nadu, India
3 Department of Medical Physics, PSG Hospitals, Coimbatore, Tamil Nadu, India
4 Department of Physics, PSG Institute of Technology and Applied Research, Coimbatore, Tamil Nadu, India

Correspondence Address:
Dr. K N Govindarajan
Department of Medical Physics, PSG Hospitals, Coimbatore - 641 004, Tamil Nadu
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0971-6203.202425

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The aim of this article is to assess Tamil Nadu pediatric computed tomography (CT) diagnostic reference levels (DRLs) by collecting radiation dose data for the most commonly performed CT examinations. This work was performed for thirty CT scanners installed in various parts of the Tamil Nadu region. The patient cohort was divided into two age groups: <1 year, and 1–5 years. CT dose indices were measured using a 10 cm3 pencil ion chamber with pediatric head and body polymethyl methacrylate phantoms. Dose data such as volumetric CT dose index (CTDIv) and dose length product (DLP) on a minimum of twenty average-sized pediatric patients in each category were recorded to calculate a mean site CTDIvand DLP value. The rounded 75th percentile was used to calculate a pediatric DRL for each hospital, and then region by compiling all results. Data were collected for 3600 pediatric patients. Pediatric CT DRL for two age groups: <1 year (CTDIvand DLP of head [20 mGy, 352], chest [7 mGy, 120] and abdomen [12 mGy, 252]), and 1–5 years (CTDIvand DLP of head [38 mGy, 505], chest [8 mGy, 132] and abdomen [14 mGy, 270]) for select procedures have been calculated. Proposed pediatric DRLs of CTDIvand DLP for head procedure were lower, and for chest and abdomen procedures were higher than European pediatric DRLs for both age groups.

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